CN105765354A - Capacitance-type sensor probe - Google Patents
Capacitance-type sensor probe Download PDFInfo
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- CN105765354A CN105765354A CN201480064560.1A CN201480064560A CN105765354A CN 105765354 A CN105765354 A CN 105765354A CN 201480064560 A CN201480064560 A CN 201480064560A CN 105765354 A CN105765354 A CN 105765354A
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- sensor probe
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- container
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
- G01F23/268—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors mounting arrangements of probes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Sensor probes for capacitance-type liquid level sensors do not comprise an acceptable balance between cost, performance and durability for mobile applications. An improved sensor probe is provided. A first electrode comprises two or more first plate sections arranged in angular relationship with respect to each other. A second electrode comprises two or more second plate sections arranged in angular relationship with respect to each other. Spacers are located between the first and second electrodes such that each first plate section is spaced apart in parallel and substantially overlapping relationship with respective second plate sections. Fasteners securely fix the first and second electrodes in position.
Description
Invention field
The application relates to the sensor probe of capacitance level transducer.
Background of invention
Capacitance level transducer is measured the liquid level in container and includes the sensor probe being immersed in liquid medium.Sensor probe includes the pair of electrodes forming capacitor, has and serve as dielectric liquid and/or air between described electrode.Along with the liquid level in container changes, the effective dielectric constant between electrode changes, and this changes the electric capacity of sensor probe.Liquid level can be determined by detecting and measure the change of electric capacity.
The concentric contact tube of known use is as the electrode of sensor probe.Compared with the volume that electrode occupies, this layout provides relatively large surface area in-between the electrodes, thus allowing to form relatively large electric capacity.The electric capacity of the per unit height of sensor probe is more big, and the electric capacity that per unit liquid level changes changes more big, thus allowing the sensitivity of level gauging bigger.For concentric tube sensor probe, it is difficult to the tolerance limit of the internal diameter of the outer tube in the liquid level sensor of reduction low cost and the external diameter of interior pipe.Between part and part, change in these sizes causes the error of level gauging.Needing exploitation that interior pipe is arranged customization distance piece within the outer tube, this causes that cost increases further.For these and other reason, develop parallel plate type sensor probe.
Parallel plate type sensor probe includes two plate electrodes being spaced apart from each other.In the Mobile solution of the liquid level of the fuel in liquid level sensor measurement tank, elongated probe can be easy to bending, and rocking of fuel may result in plate electrode deformation.Resist the limitation system of the bending intensity property required with the deformation thickness to reducing and directly relevant to the cost of sensor probe.
On April 23rd, 1985 discloses a kind of liquid container with battery lead plate to the NissanMotorCompany U.S. Patent No. 4,512,067 (' 067 patent) promulgated, described battery lead plate detects liquid level by measuring electric capacity.Sensor probe is formed by dividing plate 20A and 20B and battery lead plate 30A, 30B and 30C.More specifically, a capacitor is formed between dividing plate 20A and battery lead plate 30A, and another capacitor is formed between dividing plate 20B and battery lead plate 30B, and the 3rd capacitor is formed between dividing plate 20B and 30C.Dividing plate has dual-use function, and namely (1) suppresses the liquid fuel contained in tank quickly and fiercely moving and/or catastrophic fluctuation during vehicle operating, and (2) serve as the electrode of three capacitors.Although the wall thickness of the thickness of dividing plate 20A and the 20B upper casing 12 less than tank 10 and lower casing 14, but can be how thin there is restriction for dividing plate because dividing plate in order to suppress liquid fuel quickly and fierce mobile and/or catastrophic fluctuation.Additionally, the layout forming the electrode of sensor probe capacitor is complicated and expensive, and reduce the accuracy of level gauging.When rocking, excessive dividing plate electrode reboots the fuel rocked flowing between electrode for capacitors, thus effectively changing dielectric constant, thus causing level gauging error.
State of art is a lack of providing accurately and repeatably capacitance measurement, occupies relatively small volume and for manufacturing being economic sensor probe.Need the capacitance type sensor probe with the improvement of these characteristics.
Brief summary of the invention
The sensor probe of a kind of improvement is provided.First electrode includes the two or more first plate parts relative to each other arranged with angular relationship.Second electrode includes the two or more second plate parts relative to each other arranged with angular relationship.Distance piece is between described first electrode and described second electrode so that each first plate part is spaced apart with parallel and substantially overlapping relation with corresponding second plate part.Described first and second electrodes are tightly secured to appropriate location by securing member.
The electric field line sent from the first end of said two or multiple first plate part terminates at said two or corresponding second end of multiple second plate part in predetermined marginal range.The thickness of each first and second plate parts is less than 10 millimeters, and is preferably less than 5 millimeters, and more preferably in the scope of 0.5 millimeter to 4 millimeter.Described sensor probe can be securely located in the container holding liquid so that sensor probe and described container electric isolution.
In preferred embodiments, described distance piece is packing ring and described securing member includes screw bolt and nut.Described first and second electrodes include the hole being directed at described packing ring, described bolt is extended from the side of described first electrode, described first electrode will be fastened on the opposite side of described second electrode by described nut, and then described first and second electrodes are fastened on appropriate location.Described first electrode can include recessed groove around respective aperture and described packing ring include can intermeshing shoulder with described groove.
In another preferred embodiment of the present, described distance piece includes the first band and second strip.Described first band is positioned at the adjacent one end of described first and second electrodes and described second strip is positioned near opposing ends so that described first band and described second strip extend to lower end from the upper end of described first and second electrodes.Securing member (such as bolt or rivet) can extend across the hole of the alignment in described first and second electrodes and described first band and second strip, so that described first and second electrodes are fastened on appropriate location.
In another preferred embodiment, described first electrode includes first, second, and third plate part, and described second electrode includes the four, the 5th and the 6th plate part.Described first, second, and third plate part respectively with described four, the 5th and the 6th plate part spaced apart, and equal with described six, the 5th and the 4th plate part respectively in the length that described first, second, and third plate part is in a lateral direction.
Accompanying drawing is sketched
Fig. 1 is the schematic diagram according to the sensor probe (not drawn on scale) in the low-temperature (low temperature) vessel being connected with measuring circuit of the first embodiment.
Fig. 2 is the plane graph of the sensor probe of Fig. 1.
Fig. 3 is the perspective view of the sensor probe of Fig. 1.
Fig. 4 is the line A-A ' of the sensor probe along Fig. 1 sectional view intercepted.
Fig. 5 is the exploded view of the sensor probe of Fig. 1.
Fig. 6 is the detail view near the end section of the sensor probe of Fig. 1.
Fig. 7 is the detail view near the end section of the sensor probe similar with the sensor probe of Fig. 1, and wherein the second end of the second electrode is extending beyond the first end of the first electrode, beyond part in predetermined marginal range.
Fig. 8 is the detail view near the end section of the sensor probe similar with the sensor probe of Fig. 1, and wherein the second end of the second electrode extends beyond the first end of the first electrode, beyond part outside predetermined marginal range.
Fig. 9 is the perspective view of the sensor probe including the elongate strips for distance piece according to the second embodiment.
Detailed description of the preferred embodiments
Seeing figures.1.and.2, it is shown that the sensor probe 10 according to the first embodiment, sensor probe 10 is arranged in container 20 and is anchored in container 20.Sensor probe 10 is a part for the capacitance level transducer of the liquid level for measuring the liquid 30 in container 20.In some applications, container 20 is the low-temperature (low temperature) vessel for storing cryogenic liquid (such as liquefied natural gas (LNG), liquid methane or liquefied propane (LPG)).In other embodiments, container 10 can be any kind of container holding liquid, and liquid liquid level in container needs measured.Sensor probe 10 is electrically connected by line 40 with controller 50, controller is also referred to as measuring circuit, its operation is to send the signal of telecommunication to sensor probe and to measure gained voltage or current signal (capacitance measurement signal) so that can determine that the electric capacity of sensor probe.The Canadian Patent No.2,629,960 owned together of applicant discloses the example of this controller 50.In preferred embodiments, sensor probe 10 and container 20 electrically insulate, and this can be advantageous for from container conduction to the electric noise of controller 50 for reducing.In the disclosure, electric noise is the undesired signal of telecommunication being superimposed on the capacitance measurement signal of sensor probe 10.For example, when the fuel tank that container 20 is in automobile application, if sensor probe 10 does not electrically insulate with container, then electromotor electric noise can pass through what container conduction to controller 50 was possible to.The accuracy of the measurement of the electric capacity of lower noise sensor probe 10 and therefore reduce the accuracy that liquid level is determined.When sensor probe 10 is isolated with container 20, line 40 includes being connected to the first electric wire of the first electrode 100 and being connected to the second electric wire of the second electrode 110.When sensor probe 10 does not electrically insulate with container 20, then line 40 can only include the first electric wire being connected to the first electrode 100, and the second electrode 110 is connectable to container 20, container 20 ground connection, but is not required for so and still can adopting the second electric wire.Also illustrating that pump 60 in Fig. 1 and Fig. 2, it for being pumped to downstream consumer (such as internal combustion engine) by conduit 70 by liquid 30.Fluid pressure line 80 supplies hydraulic fluid to activate pump 60.
It is more fully described sensor probe 10 referring now to Fig. 3, Fig. 4 and Fig. 5.Sensor probe 10 includes the first electrode 100 and the second electrode 110.In preferred embodiments, first electrode 100 is the single plate forming the first plate part 101,102 and 103 (being referred to as " the first plate part "), and the second electrode 110 is also the single plate forming the second plate part 111,112 and 113 (being referred to as " the second plate part ").In other embodiments, electrode can each include two or more plate part, wherein each electrode have equal number of plate part and wherein each electrode there is substantially the same shape.In another preferred embodiment of the present, the length L of the first plate part 101101It is substantially equal to the length L of the second plate part 113113, the length L of the first plate part 103103It is substantially equal to the length L of the second plate part 111111, and the length L of the first plate part 102102It is substantially equal to the length L of the second plate part 112112.Length L101、L102、L103、L111、L112And L113Represent the length on the horizontal direction of sensor probe 10.First plate part 101 and 102 is arranged relative to each other angledly, and as represented by angle [alpha], α is about 90 degree in illustrated embodiment, but is not required for so.Similarly, the first plate part 102 and 103 is arranged relative to each other angledly, and the second plate part 111 and 112 is arranged relative to each other angledly, and the second plate part 112 and 113 is arranged relative to each other angledly.First plate part 101,102 and 103 respectively with the second plate part 111,112 and 113 spaced apart so that the first electrode 100 and the second electrode 110 spaced at intervals S.It is preferred for having uniform intervals between first electrode 100 and the second electrode 110, but is not required for so.
First plate part 101,102 and 103 respectively substantially with the second plate part 111,112 and 113 overlapping.In the disclosure, overlay defining is " having the part substantially the same with the part of other things ".First plate part and the second plate partly overlap, the electric field line formed in-between when current potential is present between the first electrode 100 and the second electrode 110 is generally extended with right angle relative to the surface 120 and 130 of these electrodes, and the electric field line sent near transverse end 140 and 150 correspondingly terminates near corresponding transverse end 160 and 170 in predetermined marginal range.This illustrates in figure 6, and Fig. 6 illustrates the detail view of the first plate part 103 near transverse end 150 and 170 and the second plate part 113 respectively.Electric field line 180 extends between electrode 100 and 110.The electric field line 181 and 182 sent in transverse end 150 extends towards transverse end 170 and terminates at transverse end 170.Fig. 7 illustrates the example of amendment, and wherein the transverse end 170 ' of the second plate part 113 ' extends beyond the transverse end 150 of the first plate part 103.But, electrode 103 and 113 ' is substantially overlapping so that the electric field line 181 ' and 182 ' sent from transverse end 150 terminates in transverse end 170 ' termination or sufficiently close together transverse end 170 '.In the explanation of Fig. 8, the second plate part 113 " transverse end 170 " extend beyond transverse end 150, beyond part outside predetermined marginal range so that from the electric field line 181 that transverse end 150 sends " and 182 " not in transverse end 170 " or near termination.In the embodiment of Fig. 8, test result has shown that sensor probe 10 " rock more sensitive with sensor probe 10 and 10 ' the phase comparison that is described separately in Fig. 6 and Fig. 7.For example, when the direction rocked and surface 120,130,130 ' and 130 " substantially at a right angle time; compared with the sensor probe 10 and 10 ' of Fig. 6 and Fig. 7; for the sensor probe 10 of Fig. 8 ", when liquid sloshing, effective dielectric constant changes largely, this is because plate 113 " extend beyond transverse end 150 further and can affect fluid at plate 103 and 113 " flowing around and between.This can cause when not changing that measured capacitance variations is relatively big by amount of liquid in container in liquid sloshing, and therefore causes sensor probe 10 " level readings change greatly.Explanation and electric field line 182,182 ' and 182 to this phenomenon " at electrode 110,110 ' and 110 " above the mode of termination is relevant.In fig. 8, electric field line 182 " terminate at surface 130 " on, and electric field line 182 and 182 ' terminates on the surface of transverse end 170 and 170 '.When rocking generation, compared with near electric field line 182 and 182 ', at electric field line 182 " near effective dielectric constant can change largely.When rocking generation, compared with sensor probe 10 and 10 ', sensor probe 10 " electric capacity change largely, this is because sensor probe 10 " support that the ability of electric field density changes largely.
Being back to Fig. 3, Fig. 4 and Fig. 5, distance piece 200 works so that the first electrode 100 and the second electrode 110 spaced at intervals S.In preferred embodiments, distance piece 200 is shoulder packing ring, and it is inserted in the hole 210 in the first electrode 100.First electrode 100 and the second electrode 110 are tightened together by the securing member including bolt 220 and nut 230.Bolt 220 extends through the respective aperture 210 in the first electrode 100 and the second electrode 110 and distance piece 200 and is fastened on appropriate location by respective nut 230.As the technical staff for tightening technology will it is known that additional hardware (such as packing ring 240 and 250) may be utilized and is preferred, but it is not required for so.Other tightening technology (such as rivet) can be adopted to replace screw bolt and nut.
Electrode 100 and 110 can by making plate bending be formed.Corresponding bending section in electrode 100 and 110 has mutual matched bending radius, and it is illustrated as the radius r of a pair corresponding bending section in the diagram.Electrode 100 and 110 also can be extruded, and radius r can be less in this case so that radius r can be infinitely small or angle between opposite plate maintains constant clearance distance S in practical situations both.First plate part 101,102 and 103 and the second plate part 111,112 and 113 can also be independent plates, and it is such as by welding or be fastenedly connected to together to form electrode 100 and 110 respectively.In preferred embodiments, the first electrode 100 and the second electrode 110 have same thickness T, but are not required for so.In preferred embodiments, thickness T is less than 10 millimeters (mm), and is even more preferably less than 5mm.In a more preferred embodiment, thickness T is in the scope of 0.5mm to 4mm.
With reference to Fig. 9, it is shown that the sensor probe 11 according to the another embodiment being similar to previous example, wherein same parts has identical reference number, and it is likely not to have detailed description (if any).First distance piece 260 and the second distance piece 270 are elongate strips, and it extends to lower end 290 and 310 in one direction between upper end 280 and 300, and extends between surface 120 and 130 on other direction.First distance piece 260 and the second distance piece 270 work to retain the liquid between the first electrode 100 and the second electrode 110 when rocking, amount of liquid between first electrode and the second electrode is kept essentially constant, and therefore the effective dielectric constant of sensor probe 11 and electric capacity are kept essentially constant.Liquid can into and out the space between the first electrode 100 and the second electrode 110 below lower end 290 and 310 and above upper end 280 and 300.These those application rocked because of holding its moving of container at the measured liquid of liquid level are advantageous for.In preferred embodiments, the surface faced out of the first distance piece 260 be positioned at transverse end 140 and 160 place the near surface faced out or with the surface copline faced out at transverse end 140 and 160 place, and second the surface faced out of distance piece 270 be positioned at the first electrode 100 and the second electrode 110 respective transversal end 150 and 170 place the near surface faced out or with the surface copline faced out at transverse end 150 and 170 place, make with when the first distance piece is from the surface of transverse end 140 and 160 to inner position and/or the second distance piece from the surface of transverse end 150 and 170 to inner position phase ratio, the region expansion limited by the plate between distance piece and the electric capacity between the first distance piece and the second distance piece increase.
While there has been shown and described that the element-specific of the present invention, embodiment and application, it should be appreciated that the invention is not restricted to this, because those skilled in the art can especially modify without deviating from the scope of the present invention according to teachings above.
Claims (13)
1. for a sensor probe for capacitance level transducer, comprising:
First electrode, it includes the two or more first plate parts relative to each other arranged with angular relationship；
Second electrode, it includes the two or more second plate parts relative to each other arranged with angular relationship；
Distance piece, it is between described first electrode and described second electrode so that each first plate part is spaced apart with parallel and substantially overlapping relation with corresponding second plate part；And
Securing member, it is for being tightly secured to appropriate location by described first and second electrodes.
2. sensor probe as claimed in claim 1, the electric field line wherein sent from the first end of said two or multiple first plate part terminates at said two or the second end of multiple second plate part in predetermined marginal range.
3. sensor probe as claimed in claim 1, the thickness of each of which the first and second plates part is less than 10 millimeters.
4. sensor probe as claimed in claim 1, the thickness of each of which the first and second plates part is less than 5 millimeters.
5. sensor probe as claimed in claim 1, the thickness of each of which the first and second plates part is in the scope of 0.5 millimeter to 4 millimeter.
6. sensor probe as claimed in claim 1, wherein said distance piece includes packing ring.
7. sensor probe as claimed in claim 6, wherein said first and second electrodes include hole, described first electrode includes recessed groove around respective aperture and described packing ring include can intermeshing shoulder with described groove, described securing member includes screw bolt and nut, and wherein respective bolt extends through respective aperture and packing ring and engages with respective nut described first and second electrodes are fastened on relative position.
8. sensor probe as claimed in claim 1, wherein said distance piece includes the first band and second strip, described first band is positioned near the corresponding transverse end of described first and second electrodes and described second strip is positioned near relative corresponding transverse end, and described first band and described second strip extend to lower end from the upper end of described first and second electrodes.
9. sensor probe as claimed in claim 8, wherein said first and second electrodes include hole plus described first band and described second strip, described securing member includes screw bolt and nut, and wherein respective bolt extends through corresponding concentric holes and engages with respective nut described first and second electrodes are fastened on relative position.
10. sensor probe as claimed in claim 1, wherein said first electrode includes first, second, and third plate part and described second electrode includes the four, the 5th and the 6th plate part, described first, second, and third plate part respectively with described four, the 5th and the 6th plate part spaced apart.
11. sensor probe as claimed in claim 10, wherein said first, second, and third plate part length in a lateral direction is substantially identical with described six, the 5th and the 4th plate part respectively.
12. a combination for sensor probe as claimed in claim 1 and the container for liquid, wherein said sensor probe is relative to the fastening of described container and electrically insulates with described container.
13. for the equipment providing variable condenser, comprising:
Described sensor probe as claimed in claim 1；
Container, it is for holding the liquid of variable；And
First and second electric wires, it is respectively connecting to described first and second electrodes；
Wherein said first and second electrodes are relative to the fastening of described container and electrically insulate with described container.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2,835,473 | 2013-11-28 | ||
| CA2835473A CA2835473C (en) | 2013-11-28 | 2013-11-28 | A capacitance-type sensor probe |
| PCT/CA2014/051092 WO2015077874A1 (en) | 2013-11-28 | 2014-11-14 | Capacitance-type sensor probe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105765354A true CN105765354A (en) | 2016-07-13 |
| CN105765354B CN105765354B (en) | 2019-12-10 |
Family
ID=50112507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480064560.1A Active CN105765354B (en) | 2013-11-28 | 2014-11-14 | Capacitive sensor probe |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US10444054B2 (en) |
| EP (1) | EP3074732B1 (en) |
| CN (1) | CN105765354B (en) |
| CA (1) | CA2835473C (en) |
| WO (1) | WO2015077874A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109340563A (en) * | 2018-11-19 | 2019-02-15 | 苏州赛智达智能科技有限公司 | Capacitance level gauge and LNG gas cylinder |
| CN109341813A (en) * | 2018-11-19 | 2019-02-15 | 苏州赛智达智能科技有限公司 | The signal output apparatus and LNG gas cylinder of capacitance level gauge |
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2013
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2014
- 2014-11-14 CN CN201480064560.1A patent/CN105765354B/en active Active
- 2014-11-14 EP EP14865290.2A patent/EP3074732B1/en active Active
- 2014-11-14 WO PCT/CA2014/051092 patent/WO2015077874A1/en active Application Filing
- 2014-11-14 US US15/038,807 patent/US10444054B2/en active Active
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| GB2089516A (en) * | 1980-12-15 | 1982-06-23 | Nissan Motor | Liquid container having electrode plates to detect liquid level by measuring capacitance |
| US4591946A (en) * | 1985-04-30 | 1986-05-27 | Southwest Pump Company | Capacitance probe for use in a measuring system for location of a liquid level interface |
| US4982606A (en) * | 1989-03-06 | 1991-01-08 | Raytheon Company | Fluid level sensor and controller |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109340563A (en) * | 2018-11-19 | 2019-02-15 | 苏州赛智达智能科技有限公司 | Capacitance level gauge and LNG gas cylinder |
| CN109341813A (en) * | 2018-11-19 | 2019-02-15 | 苏州赛智达智能科技有限公司 | The signal output apparatus and LNG gas cylinder of capacitance level gauge |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3074732B1 (en) | 2020-02-26 |
| EP3074732A4 (en) | 2017-07-12 |
| US20170030760A1 (en) | 2017-02-02 |
| US10444054B2 (en) | 2019-10-15 |
| CA2835473C (en) | 2015-01-20 |
| WO2015077874A1 (en) | 2015-06-04 |
| EP3074732A1 (en) | 2016-10-05 |
| CA2835473A1 (en) | 2014-02-11 |
| CN105765354B (en) | 2019-12-10 |
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